One week after stressing the need to go after known threats from "a certain community," King reinforced that notion, specifically questioning the FBI's decision to not speak to Boston police about now deceased bombing suspect Tamerlan Tsarnaev.

Ellison recognized the need for public safety. But he sees it as "ineffective law enforcement to go after a particular community."

“Once you start saying we’re going to dragnet or surveil a community, what you do is you ignore dangerous threats that are not in that community and you go after people who don’t have anything to do with it," Ellison said.

Ellison pointed to events in the past and present, notably the recent string of ricin letters in Washington and historic example of Japanese Americans in World War II. King scoffed at that latter comparison, saying that "no one is talking about internment."

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Politicians React To Boston Marathon Explosion

Politicians React To Boston Marathon Explosion

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Gov. Deval Patrick (D-Mass.)

“This is a horrific day in Boston. My thoughts and prayers are with those who have been injured. I have been in touch with the President, Mayor Menino and our public safety leaders. Our focus is on making sure that the area around Copley Square is safe and secured. I am asking everyone to stay away from Copley Square and let the first responders do their jobs.”